Chemical interaction of Ce-Fe mixed oxides for methane selective oxidation
来源期刊：Journal of Rare Earths2014年第9期
论文作者：祝星 杜云鹏 王华 魏永刚 李孔斋 孙令玥
文章页码：824 - 830
摘 要：Chemical interaction of Ce-Fe mixed oxides was investigated in methane selective oxidation via methane temperature programmed reduction and methane isothermal reaction tests over Ce-Fe oxygen carriers. In methane temperature programmed reduction test, Ce-Fe oxide behaved complete oxidation at the lower temperature and selective oxidation at higher temperatures. Ce-Fe mixed oxides with the Fe content in the range of 0.1–0.5 was able to produce syngas with high selectivity in high-temperature range（800–900 °C）, and a higher Fe amount over 0.5 seemed to depress the CO formation. In isothermal reaction, complete oxidation occurred at beginning following with selective oxidation later. Ce1–xFexO2–δ oxygen carriers（x≤0.5） were proved to be suitable for the selective oxidation of methane. Ce-Fe mixed oxides had the well-pleasing reducibility with high oxygen releasing rate and CO selectivity due to the interaction between Ce and Fe species. Strong chemical interaction of Ce-Fe mixed oxides originated from both Fe*activated CeO2 and Ce3+ activated iron oxides（FeOm）, and those chemical interaction greatly enhanced the oxygen mobility and selectivity.
祝星1,2，杜云鹏1,2，王华1,2，魏永刚1,2，李孔斋1,2，孙令玥3
1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology3. Faculty of Chemical Engineering, Kunming University of Science and Technology
摘 要：Chemical interaction of Ce-Fe mixed oxides was investigated in methane selective oxidation via methane temperature programmed reduction and methane isothermal reaction tests over Ce-Fe oxygen carriers. In methane temperature programmed reduction test, Ce-Fe oxide behaved complete oxidation at the lower temperature and selective oxidation at higher temperatures. Ce-Fe mixed oxides with the Fe content in the range of 0.1–0.5 was able to produce syngas with high selectivity in high-temperature range（800–900 °C）, and a higher Fe amount over 0.5 seemed to depress the CO formation. In isothermal reaction, complete oxidation occurred at beginning following with selective oxidation later. Ce1–xFexO2–δ oxygen carriers（x≤0.5） were proved to be suitable for the selective oxidation of methane. Ce-Fe mixed oxides had the well-pleasing reducibility with high oxygen releasing rate and CO selectivity due to the interaction between Ce and Fe species. Strong chemical interaction of Ce-Fe mixed oxides originated from both Fe*activated CeO2 and Ce3+ activated iron oxides（FeOm）, and those chemical interaction greatly enhanced the oxygen mobility and selectivity.
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